In class IX, the average of marks in science for six students was 48. After result declared, it was found in case of one student, the marks 45 were misread as 54. The correct average is: :
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 46.50
Average = sum / total number of person
48 = sum / 6
sum = 48 × 6 = 288
Here after result declared, it was found in case of one student, the marks 45 were misread as 54
so correct sum should be 9 less than 288(54 - 45)
correct sum is 279
The correct average is 279/6 = 46.50.